When mb_convert_encoding function UTF-8 is converted to gbk, the question mark is raised when the space is changed.

When the mb_convert_encoding function UTF-8 is converted to gbk, the question mark of space is changed. how can this problem be solved? Only space becomes question mark, and other Chinese characters are normally shared to: when the mb_convert_encoding function UTF-8 is converted to gbk, space becomes question mark.
How can this problem be solved? Only spaces are converted into question marks, and other Chinese characters are normal.

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Check the source code and check that the Space is not normal (0x20), but 0xA0: No-Break Space (that is, nbsp)
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You can't blame others if you're wrong.
$ Str = str_replace ("0xC2 0xA0", '', $ str );
Should be
$ Str = str_replace ("\ xC2 \ xA0", '', $ str );